Hi,
Posting this here in case someone has a similar question in the future as I was
unable to find anything of this sort online to use as an example.
What I ended up doing was splitting up the image into partitions then assigning
texture coordinates appropriately.
Code:
//loads in ground image, applies to square
osg::Geode* groundGeode = new osg::Geode;
std::vector<osg::Geometry*> groundGeometry;
//assign coordinates to ground geode
std::vector<osg::Vec3Array*> groundEnds;
std::vector<osg::DrawElementsUInt*> groundDrawElements;
std::vector<osg::Vec2Array*> texCoords;
//colors
osg::ref_ptr<osg::Vec4Array> colorsTex (new osg::Vec4Array());
colorsTex->push_back (osg::Vec4 (1.0f, 1.0, 1.0f, 1.0f));
//normals
osg::ref_ptr<osg::Vec3Array> normals (new osg::Vec3Array());
normals->push_back (osg::Vec3 (0.0f, 0.0f, 1.0f));
//define width (adjusted manually to approximate right size;
int w;
//13250
//12800
w = 12650;
int numbRowCol = 25;
float xl, xr, yb, yt; //x left, x right, y bottom, y top
float txl, txr, tyb, tyt;
int iterator;
iterator = 0;
for (int i = 0; i < numbRowCol; i++) {
for (int j = 0; j < numbRowCol; j++) {
//create new instances of each required class
groundGeometry.push_back(new osg::Geometry() );
groundEnds.push_back(new osg::Vec3Array);
groundDrawElements.push_back(new
osg::DrawElementsUInt(osg::PrimitiveSet::QUADS, 0));
texCoords.push_back(new osg::Vec2Array(4));
//assign vertex based on square
xl = -w/2 + w * ((float)i/ (float)numbRowCol);
yb = -w/2 + w * ((float)j/ (float)numbRowCol);
xr = -w/2 + w * ((float)(i+1) / (float)numbRowCol);
yt = -w/2 + w * ((float)(j+1) / (float)numbRowCol);
groundEnds[iterator]->push_back( osg::Vec3( xl , yb , 0
) ); //bottom left
groundEnds[iterator]->push_back( osg::Vec3( xl , yt , 0
) ); //top left
groundEnds[iterator]->push_back( osg::Vec3( xr , yt , 0
) ); //top right
groundEnds[iterator]->push_back( osg::Vec3( xr , yb , 0
) ); //bottom right
groundGeometry[iterator]->setVertexArray(groundEnds[iterator]);
//create drawable
groundDrawElements[iterator]->push_back(3);
groundDrawElements[iterator]->push_back(2);
groundDrawElements[iterator]->push_back(1);
groundDrawElements[iterator]->push_back(0);
groundGeometry[iterator]->addPrimitiveSet(groundDrawElements[iterator]);
//define texture coordinates
txl = 0.5 + xl/w;
txr = 0.5 + xr/w;
tyb = 0.5 + yb/w;
tyt = 0.5 + yt/w;
(*texCoords[iterator])[0].set(txl, tyb);
(*texCoords[iterator])[1].set(txl, tyt);
(*texCoords[iterator])[2].set(txr, tyt);
(*texCoords[iterator])[3].set(txr, tyb);
groundGeometry[iterator]->setTexCoordArray(0,texCoords[iterator]);
//add current draw element to geode to be rendered
groundGeode->addDrawable(groundGeometry[iterator]);
//colors
groundGeometry[iterator]->setColorArray
(colorsTex.get());
groundGeometry[iterator]->setColorBinding
(osg::Geometry::BIND_OVERALL);
//normals
groundGeometry[iterator]->setNormalArray
(normals.get());
groundGeometry[iterator]->setNormalBinding
(osg::Geometry::BIND_OVERALL);
iterator++;
}
}
/*
assign texture for ground
*/
osg::Texture2D* groundTexture = new osg::Texture2D;
// protect from being optimized away as static state:
/groundTexture->setDataVariance(osg::Object::DYNAMIC);
// load an image by reading a file:
osg::Image* groundImage =
osgDB::readImageFile("models/textures/background_photoshop.jpg");
if (!groundImage)
{
std::cout << " couldn't find texture." << std::endl;
}
// Assign the texture to the image we read from file:
groundTexture->setImage(groundImage);
// Create a new StateSet with default settings:
osg::StateSet* stateOne = new osg::StateSet();
// Assign texture unit 0 of our new StateSet to the texture
stateOne->setTextureAttributeAndModes(0,groundTexture,osg::StateAttribute::ON);
// Associate this state set with the Geode that contains
// the pyramid:
groundGeode->setStateSet(stateOne);
osg::PositionAttitudeTransform* groundXform = new
osg::PositionAttitudeTransform();
groundXform->setPosition(osg::Vec3(0,0.0,0));
groundXform->addChild(groundGeode);
root->addChild(groundXform);
Thank you!
Cheers,
Alden
------------------
Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=34784#34784
_______________________________________________
osg-users mailing list
[email protected]
http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
